/* 页面整体样式 */
body {
    font-family: Arial, sans-serif;
    line-height: 1.6;
    color: #333;
    margin: 0;
    padding: 0;
    background-color: #f4f4f4;
}

/* Header and Navigation */
header {
    background-color: #007BFF;
    padding: 20px;
    color: white;
    text-align: center;
}

header .logo {
    font-size: 30px;
}

nav {
    background-color: #333;
    color: white;
    padding: 10px 0;
    text-align: center;
}

nav ul {
    list-style: none;
    padding: 0;
    margin: 0;
}

nav ul li {
    display: inline;
    margin-right: 20px;
}

nav ul li a {
    color: white;
    text-decoration: none;
}

/* Tutorial Introduction */
.tutorial-intro {
    text-align: center;
    padding: 40px;
    background-color: #fff;
    margin: 20px;
    border-radius: 10px;
}

.tutorial-intro h1 {
    font-size: 32px;
}

.tutorial-intro p {
    font-size: 18px;
}

/* Tutorial Index */
.tutorial-index {
    text-align: center;
    background-color: #fff;
    margin: 20px;
    padding: 20px;
    border-radius: 10px;
}

.tutorial-index h2 {
    font-size: 28px;
    margin-bottom: 20px;
}

.tutorial-index ul {
    list-style: none;
    padding: 0;
}

.tutorial-index ul li {
    margin-bottom: 10px;
}

.tutorial-index ul li a {
    color: #007BFF;
    text-decoration: none;
    font-size: 20px;
}

/* Tutorial Content */
.tutorial-section {
    margin: 40px;
    background-color: #fff;
    padding: 20px;
    border-radius: 10px;
}

.tutorial-section h2 {
    font-size: 28px;
    margin-bottom: 20px;
}

.tutorial-section h3 {
    font-size: 24px;
    margin-top: 20px;
}

.tutorial-section p {
    font-size: 18px;
    line-height: 1.8;
}

.tutorial-section img,
.tutorial-section video {
    width: 100%;
    margin-top: 20px;
    border: 1px solid #ddd;
}

/* Footer */
footer {
    text-align: center;
    background-color: #333;
    color: white;
    padding: 20px;
    margin-top: 40px;
}
